Influence of micelles on protein's denaturation
| Autor: | Md. Sayem Alam, Rachana Srivastava |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Protein Conformation
alpha-Helical Protein Denaturation Circular dichroism 02 engineering and technology Biochemistry Micelle Hydrophobic effect Surface-Active Agents 03 medical and health sciences chemistry.chemical_compound Structural Biology medicine Animals Humans Protein Interaction Domains and Motifs Denaturation (biochemistry) Sodium dodecyl sulfate Molecular Biology Micelles Serum Albumin 030304 developmental biology 0303 health sciences Binding Sites technology industry and agriculture Sodium Dodecyl Sulfate General Medicine Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Human serum albumin Molecular Docking Simulation body regions Isoelectric point chemistry Critical micelle concentration Biophysics Thermodynamics Protein Conformation beta-Strand Rabbits 0210 nano-technology Hydrophobic and Hydrophilic Interactions Protein Binding medicine.drug |
| Zdroj: | International Journal of Biological Macromolecules. 145:252-261 |
| ISSN: | 0141-8130 |
| Popis: | To evaluate the role of micelles for protein-surfactant interaction, we have studied the binding modes of serum albumin proteins (human (HSA) and rabbit (RSA)) with anionic-surfactant, sodium dodecyl sulfate (SDS) by using UV–visible, fluorescence, circular dichroism, fluorescence lifetime, atomic force microscopy (AFM) techniques. The study performed with three different pHs (below (4.0), at (4.7), and above (7.0) isoelectric point). Hydrocarbon chain of the surfactant, dominant role of hydrophobic forces and electrostatic interactions helped in polar interaction on protein on binding surfaces. The change above and below the critical micelle concentration (CMC) in fluorescence spectra was due to polarity of the microenvironment. The CD spectra different binding aspects as below CMC and above CMC, explain about folding and unfolding in secondary structure. Surfactant's binding induces fluctuations in the microenvironment of aromatic amino acid's residues of both proteins at different pHs. AFM images clarify the structural changes in both proteins (HSA & RSA). AFM images also indicate some different interesting conformational and structural changes in both proteins below/above the CMC of the surfactant. The molecular docking studies indicate the binding energy −4.8 kcal mol−1 and −4.7 kcal mol−1 for HSA-SDS and RSA-SDS, respectively. Structural changes can be seen above and below the CMC. |
| Databáze: | OpenAIRE |
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